Yes. After order confirmation, our team prepares a CAD drawing for review. Simple CAD designs are usually completed within 1-3 working days, and revisions can be made before production starts. This step helps customers visualize the design clearly before manufacturing.

Customers can customize metal type, metal color, stone type, stone size, stone shape, setting style, engraving, logo, finish. This makes our service suitable for custom engagement rings, private label moissanite jewelry, lab grown diamond jewelry lines, and branded OEM ODM jewelry collections.

Yes. NDA protection can be provided for original designs, commercial projects, and brand-related information. This is especially important for clients developing exclusive products or private label jewelry lines.

Lead time depends on the product type and complexity. Simple CAD designs usually take 1–3 days. Samples typically take around 7–10 days. Custom moissanite orders may be sent out in about 3–5 working days, while custom jewelry production generally takes around 15–20 days. Bulk orders depend on quantity and design complexity.

For in-stock items, orders can usually be sent out within 1–2 working days, excluding holidays.

Shipping usually takes about 3–7 business days by DHL, FedEx, or UPS, excluding holidays. During holiday periods, delivery may take longer, sometimes around two weeks.

Tianyu Gems states that its gemstone collection can be certified by recognized authorities such as GIA, IGI, GRC, GRA, GDTC, and NGIC, depending on the product and project requirements.

Yes. Certification inquiries such as IGI and GIA can be supported depending on the item. If you require a specific certificate for a moissanite jewelry or lab grown diamond jewelry order, it is best to confirm this during quotation and order review.

Our manufacturing workflow covers stone sourcing and selection, precision cutting and polishing, CAD-based development, sample making, in-house jewelry production, and quality inspection before shipment. The custom service page also states that each piece goes through multiple quality checks before shipping. This integrated process helps us maintain reliable quality as a custom jewelry manufacturer.

According to our lifetime warranty page, moissanite, lab-grown diamonds, and lab-grown gemstones are crafted to high standards, and their optical brilliance, fire, and clarity will not fade or cloud over time under normal conditions.

Yes. Tianyu Gems offers a Lifetime Manufacturing Warranty for items purchased directly from us. The warranty covers manufacturing defects in materials and workmanship at the time of delivery and applies from the original purchase date.

The warranty does not cover normal wear and tear, surface scratches, accidental damage, loss, theft, discoloration caused by improper care, loosening due to long-term wear of precious metal parts, or gemstone loss caused by trauma or impact. Silver tarnishing caused by natural oxidation is also not considered a defect.

Eligible orders may be refunded or exchanged within 15 days after receipt, provided the item is unused, unworn, returned with original packaging and certificate, and passes quality inspection. Customized, engraved, or personalized jewelry cannot be refunded or exchanged unless there is a confirmed defect.

Custom-made, engraved, personalized, and other non-ready-to-ship items are generally non-returnable and non-exchangeable unless there is a verified manufacturing defect. Cancellation fees may apply depending on the production stage.

If your order arrives damaged or defective, please contact us immediately and provide clear photos of the item and packaging. If the issue is confirmed, we will arrange a replacement or a full refund for the goods and shipping cost.